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/* vi.c - You can't spell "evil" without "vi".
*
* Copyright 2015 Rob Landley <rob@landley.net>
*
* See http://pubs.opengroup.org/onlinepubs/9699919799/utilities/vi.html
USE_VI(NEWTOY(vi, "<1>1", TOYFLAG_USR|TOYFLAG_BIN))
config VI
bool "vi"
default n
help
usage: vi FILE
Visual text editor. Predates the existence of standardized cursor keys,
so the controls are weird and historical.
*/
#define FOR_vi
#include "toys.h"
GLOBALS(
struct linestack *ls;
char *statline;
)
struct linestack {
long len, max;
struct ptr_len idx[];
};
// Insert one stack into another before position in old stack.
// (Does not copy contents of strings, just shuffles index array contents.)
void linestack_addstack(struct linestack **lls, struct linestack *throw,
long pos)
{
struct linestack *catch = *lls;
if (CFG_TOYBOX_DEBUG)
if (pos > catch->len) error_exit("linestack_addstack past end.");
// Make a hole, allocating more space if necessary.
if (catch->len+throw->len >= catch->max) {
// New size rounded up to next multiple of 64, allocate and copy start.
catch->max = ((catch->len+throw->len)|63)+1;
*lls = xmalloc(sizeof(struct linestack)+catch->max*sizeof(struct ptr_len));
memcpy(*lls, catch, sizeof(struct linestack)+pos*sizeof(struct ptr_len));
}
// Copy end (into new allocation if necessary)
if (pos != catch->len)
memmove((*lls)->idx+pos+throw->len, catch->idx+pos,
(catch->len-pos)*sizeof(struct ptr_len));
// Cleanup if we had to realloc.
if (catch != *lls) {
free(catch);
catch = *lls;
}
memcpy(catch->idx+pos, throw->idx, throw->len*sizeof(struct ptr_len));
catch->len += throw->len;
}
void linestack_insert(struct linestack **lls, long pos, char *line, long len)
{
// alloca() was in 32V and Turbo C for DOS, but isn't in posix or c99.
// I'm not thrashing the heap for this, but this should work even if
// a broken compiler adds gratuitous padding.
struct {
struct linestack ls;
struct ptr_len pl;
} ls;
ls.ls.len = ls.ls.max = 1;
ls.ls.idx[0].ptr = line;
ls.ls.idx[0].len = len;
linestack_addstack(lls, &ls.ls, pos);
}
void linestack_append(struct linestack **lls, char *line)
{
linestack_insert(lls, (*lls)->len, line, strlen(line));
}
struct linestack *linestack_load(char *name)
{
FILE *fp = fopen(name, "r");
struct linestack *ls;
if (!fp) return 0;
ls = xzalloc(sizeof(struct linestack));
for (;;) {
char *line = 0;
ssize_t len;
if ((len = getline(&line, (void *)&len, fp))<1) break;
if (line[len-1]=='\n') len--;
linestack_insert(&ls, ls->len, line, len);
}
fclose(fp);
return ls;
}
void vi_main(void)
{
int i;
if (!(TT.ls = linestack_load(*toys.optargs)))
TT.ls = xzalloc(sizeof(struct linestack));
for (i=0; i<TT.ls->len; i++)
printf("%.*s\n", (int)TT.ls->idx[i].len, (char *)TT.ls->idx[i].ptr);
}
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